ATtiny44 datasheet(63/236 Pages) ATMEL

63 / 236 page

8006H–AVR–10/09

ATtiny24/44/84

• Port A, Bit 6 – ADC6/DI/SDA/MOSI/OC1A/PCINT6

• ADC6: Analog to Digital Converter, Channel 6.

• SDA: Two-wire mode Serial Interface Data.

• DI: Data Input in USI Three-wire mode. USI Three-wire mode does not override normal port

functions, so pin must be configure as an input for DI function.

• MOSI: Master Data output, Slave Data input for SPI channel. When the SPI is enabled as a

Slave, this pin is configured as an input regardless of the setting of DDA6. When the SPI is

enabled as a Master, the data direction of this pin is controlled by DDA6. When the pin is

forced by the SPI to be an input, the pull-up can still be controlled by the PORTA6 bit.

• OC1A, Output Compare Match output: The PA6 pin can serve as an external output for the

Timer/Counter1 Compare Match A. The pin has to be configured as an output (DDA6 set

(one)) to serve this function. This is also the output pin for the PWM mode timer function.

•PCINT6: Pin Change Interrupt source 6. The PA6 pin can serve as an external interrupt

source for pin change interrupt 0.

• Port A, Bit 7 – ADC7/OC0B/ICP1/PCINT7

• ADC7: Analog to Digital Converter, Channel 7.

• OC0B, Output Compare Match output: The PA7 pin can serve as an external output for the

Timer/Counter0 Compare Match B. The pin has to be configured as an output (DDA7 set

(one)) to serve this function. This is also the output pin for the PWM mode timer function.

• ICP1, Input Capture Pin: The PA7 pin can act as an Input Capture Pin for Timer/Counter1.

•PCINT7: Pin Change Interrupt source 7. The PA7 pin can serve as an external interrupt

source for pin change interrupt 0.

Table 10-4 and Table 10-6 relate the alternate functions of Port A to the overriding signals

shown in Figure 10-5 on page 59.

Table 10-4.

Overriding Signals for Alternate Functions in PA7..PA5

Signal

Name

PA7/ADC7/OC0B/ICP1/

PCINT7

PA6/ADC6/DI/SDA/MOSI/

OC1A/ PCINT6

PA5/ADC5/MISO/DO/

OC1B/ PCINT5

PUOE

PUOV

DDOE

USIWM1

DDOV

(SDA + PORTA6) • DDA6

PVOE

OC0B enable

(USIWM1 • DDA6) +

OC1A enable

(USIWM1 • USIWM0) + OC1B

enable

PVOV

OC0B

( USIWM1• DDA6) • OC1A

USIWM1 • USIWM0 • DO +

(USIWM1 + USIWM0) • OC1B

PTOE

DIEOE

PCINT7 • PCIE0 + ADC7D

USISIE + (PCINT6 •

PCIE0) + ADC6D

PCINT5 • PCIE + ADC5D

DIEOV

PCINT7 • PCIE0

USISIE + PCINT7 • PCIE0

PCINT5 • PCIE

PCINT7/ICP1 Input

DI/SDA/PCINT6 Input

PCINT5 Input

AIO

ADC7 Input

ADC6 Input

ADC5 Input

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